Data Quality Analysis and Control Method of X-band Dual Polarization Radar

WANG Chao; WU Chong; LIU Liping

doi:10.7522/j.issn.1000-0534.2018.00096

Plateau Meteorology >

2019 , Vol. 38 >Issue 3: 636 - 649

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00096

Data Quality Analysis and Control Method of X-band Dual Polarization Radar

WANG Chao ,
WU Chong ,
LIU Liping

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College of Electronic Engineering, Chengdu University of Information Technology, Chengdu 610225, Sichuan, China;State Key Laboratory of Severe Weather(LaSW), Chinese Academy of Meteorological Sciences, Beijing 100081, China

Received date: 2018-09-01

Online published: 2019-06-28

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Abstract

The Bureau of Meteorology in Beijing and Foshan began constructing an X-band dual-polarization radar networks to enhance their ability to elaborate nowcasting. However, in the following two years of flood season observation, it is found that there are still a series of problems in X-band dual-polarization radar, and its data quality that could be improved largely. The article uses the characteristics of polarization parameters that uniformed in nature and slowly changed with time and space in the process of weak rainfall and selects the observation data of weak precipitation process in Beijing and Foshan. Through the method of accumulating in radial or azimuth by taking a long-term observation, this paper analyzes the accuracy of polarization parameter measurement that affected by the ground, lightning rod, rotation and pitching joints and puts forward to the corresponding quality control method. The following conclusions are drawn:(1) different reflectivity factor (Z_DR), correction coefficient (ρ_hv) and differential propagation phase (Φ_DP) are more sensitive to the ground objects than horizontal polarization reflectivity factor (Z), where ρ_hv is less than 0.85, Z_DR lower than -1 dB, and a threshold of 0.9 is set according to the difference of ρ_HV between rainfall and ground objects. The ρ_hv can be accumulated for a long time to identify the echo of ground object effectively. (2) The azimuth and amplitude of each lightning rod's influence on the dual polarization parameters are approximately the same. In the ±15° azimuth range centered on the lightning rod, the Z_DR increases by approximately 0.4 dB to 1.5 dB, the ρ_hv lowers to 0.01 or less, and the Z decreases by nearly 1 to 2 dBZ, and in which these parameters will reach the extremum. Through the statistical correction based on the above azimuth, the effect of lightning protection on dual polarization parameters can be better removed. (3) The abnormality of the rotary joints will cause the Z_DR to change unevenly in the horizontal direction, while the exception of pitching joint will cause the Z_DR to have a large gap between the high and low elevation angles. The Z_DR variation curve of the elevation angle of each layer will be obtained through the accumulation of the Z_DR along the azimuth for a period of time, which can achieve Z_DR error calibration. Through the test, the quality control method proposed in this paper can effectively improve the data quality of X-band dual-polarization radar and provides support for its further promotion in operation.

Key words： X-band dual-polariza; data quality analysi; differential reflect

Cite this article

WANG Chao , WU Chong , LIU Liping . Data Quality Analysis and Control Method of X-band Dual Polarization Radar[J]. Plateau Meteorology, 2019 , 38(3) : 636 -649 . DOI: 10.7522/j.issn.1000-0534.2018.00096

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